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Equity Incentive Plan - Summary of Company's Restricted Stock (Detail) - USD ($) $ / shares in Units, $ in Thousands					3 Months Ended	9 Months Ended
	Sep. 11, 2017	May 16, 2017	May 17, 2016	Jan. 04, 2016	Sep. 30, 2017	Sep. 30, 2017
Schedule Of Nonvested Stock Option Activity [Line Items]
Number of Restricted Shares, Granted						60,605
Expected future remaining compensation expense					$ 367	$ 367
Expected future compensation expense, restricted shares remaining vesting period						2 years 11 months 4 days
Restricted Shares Awarded on March 17, 2015 [Member]
Schedule Of Nonvested Stock Option Activity [Line Items]
Number of Restricted Shares, Granted						16,699
Date of Award						Mar. 17, 2015
Expected future remaining compensation expense					9	$ 9
Expected future compensation expense, restricted shares remaining vesting period						2 months 30 days
Restricted Shares Awarded on March 11, 2016 [Member]
Schedule Of Nonvested Stock Option Activity [Line Items]
Number of Restricted Shares, Granted						15,748
Date of Award						Mar. 11, 2016
Expected future remaining compensation expense					41	$ 41
Expected future compensation expense, restricted shares remaining vesting period						1 year 2 months 30 days
Restricted Shares Awarded on March 20, 2017 [Member]
Schedule Of Nonvested Stock Option Activity [Line Items]
Number of Restricted Shares, Granted						11,713
Date of Award						Mar. 20, 2017
Expected future remaining compensation expense					126	$ 126
Expected future compensation expense, restricted shares remaining vesting period						2 years 2 months 30 days
Restricted Shares Awarded on January 15, 2016 [Member]
Schedule Of Nonvested Stock Option Activity [Line Items]
Number of Restricted Shares, Granted						10,260
Date of Award						Jan. 15, 2016
Expected future remaining compensation expense					72	$ 72
Expected future compensation expense, restricted shares remaining vesting period						3 years 2 months 30 days
Restricted Shares Awarded on March 20, 2017 [Member]
Schedule Of Nonvested Stock Option Activity [Line Items]
Number of Restricted Shares, Granted						6,185
Date of Award						Mar. 20, 2017
Expected future remaining compensation expense					$ 119	$ 119
Expected future compensation expense, restricted shares remaining vesting period						4 years 2 months 30 days
Restricted Stock [Member]
Schedule Of Nonvested Stock Option Activity [Line Items]
Number of Restricted Shares, Nonvested at beginning of period					42,138	37,050
Number of Restricted Shares, Granted	367	6,804	12,285	2,730		17,898
Number of Restricted Shares, Vested						(12,810)
Number of Restricted Shares, Forfeited					0	0
Number of Restricted Shares, Nonvested at September 30, 2017					42,138	42,138
Weighted Average Grant Date Fair Value, Nonvested at beginning of period					$ 15.60	$ 10.77
Weighted Average Grant Date Fair Value, Granted						22.15
Weighted Average Grant Date Fair Value, Vested						10.76
Weighted Average Grant Date Fair Value, Forfeited					0	0
Weighted Average Grant Date Fair Value, Nonvested at September 30, 2017					$ 15.60	$ 15.60

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Schedule Of Nonvested Stock Option Activity [Line Items]

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Share based compensation arrangement by share based payment award date.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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-Publisher FASB
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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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